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If the fuses are not the problem, if the bulbs are not the problem, then what's left?
- the sockets (though I doubt that.)
- the switches
- the ground connections or other connections, anywhere in the circuit.
Do you have a voltmeter? it can be very useful in a case like this, to verify whether voltage is, or is not, reaching any given point (whether its not reaching a point is owing to connections, wiring, switches, etc.
Is the trailer hookup still hooked up?
If so, overloads & blown fuses, wires crossed and shorting things out, etc., could all be causes.